We had quite a few inquiries this past week about K visas. Clients often mix the different K categories. Here is a brief summary for our confused readers.
On December 21, 2000, President Bill Clinton signed into law the Legal Immigration Family Equity Act (LIFE Act). The Life Act made K status available to spouses and children who are the beneficiaries of pending or approved Form I-130 immigrant relative petitions.
Subsequently, the Life Act was amended, thereby expanding the K category to include spouses and spouses’ children of U.S. citizens who are waiting outside the United States after filing of an immigrant relative petition. The spouses of U.S. citizens under K status are now classified as “K-3”, and the children of such spouses as “K-4”. The K-3 and K-4 visas have specific requirements for filing due to the different nature of the petitions.
Visa Lawyer Blog

